git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/input.cpp

   1 #include "..\stdafx.h"\r
   2 \r
   3 #include "input.h"\r
   4 \r
   5 #include <core/video_format.h>\r
   6 \r
   7 #include <common/concurrency/executor.h>\r
   8 #include <common/diagnostics/graph.h>\r
   9 #include <common/utility/printer.h>\r
  10 \r
  11 #include <tbb/concurrent_queue.h>\r
  12 #include <tbb/queuing_mutex.h>\r
  13 \r
  14 #include <boost/exception/error_info.hpp>\r
  15 #include <boost/thread/once.hpp>\r
  16 #include <boost/thread/thread.hpp>\r
  17 \r
  18 #include <errno.h>\r
  19 #include <system_error>\r
  20                 \r
  21 #if defined(_MSC_VER)\r
  22 #pragma warning (disable : 4244)\r
  23 #endif\r
  24 \r
  25 extern "C" \r
  26 {\r
  27         #define __STDC_CONSTANT_MACROS\r
  28         #define __STDC_LIMIT_MACROS\r
  29         #include <libavformat/avformat.h>\r
  30 }\r
  31 \r
  32 namespace caspar {\r
  33                 \r
  34 struct input::implementation : boost::noncopyable\r
  35 {               \r
  36         static const size_t PACKET_BUFFER_COUNT = 50;\r
  37 \r
  38         printer parent_printer_;\r
  39         safe_ptr<diagnostics::graph> graph_;\r
  40 \r
  41         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
  42 \r
  43         std::shared_ptr<AVCodecContext> video_codec_context_;\r
  44         std::shared_ptr<AVCodecContext> audio_codex_context_;\r
  45         \r
  46         const std::wstring filename_;\r
  47 \r
  48         bool loop_;\r
  49         int video_s_index_;\r
  50         int     audio_s_index_;\r
  51                 \r
  52         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> video_packet_buffer_;\r
  53         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> audio_packet_buffer_;\r
  54 \r
  55         boost::condition_variable cond_;\r
  56         boost::mutex mutex_;\r
  57         \r
  58         executor executor_;\r
  59 public:\r
  60         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, const printer& parent_printer) \r
  61                 : parent_printer_(parent_printer)\r
  62                 , graph_(graph)\r
  63                 , loop_(loop)\r
  64                 , video_s_index_(-1)\r
  65                 , audio_s_index_(-1)\r
  66                 , filename_(filename)\r
  67                 , executor_(print())\r
  68         {                       \r
  69                 graph_->set_color("input-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));\r
  70                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
  71 \r
  72                 int errn;\r
  73                 AVFormatContext* weak_format_context_;\r
  74                 if((errn = -av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr)) > 0)\r
  75                         BOOST_THROW_EXCEPTION(\r
  76                                 file_read_error() << \r
  77                                 source_info(narrow(print())) << \r
  78                                 msg_info("No format context found.") << \r
  79                                 boost::errinfo_api_function("av_open_input_file") <<\r
  80                                 boost::errinfo_errno(errn) <<\r
  81                                 boost::errinfo_file_name(narrow(filename)));\r
  82 \r
  83                 format_context_.reset(weak_format_context_, av_close_input_file);\r
  84                         \r
  85                 if((errn = -av_find_stream_info(format_context_.get())) > 0)\r
  86                         BOOST_THROW_EXCEPTION(\r
  87                                 file_read_error() << \r
  88                                 source_info(narrow(print())) << \r
  89                                 boost::errinfo_api_function("av_find_stream_info") <<\r
  90                                 msg_info("No stream found.") << \r
  91                                 boost::errinfo_errno(errn));\r
  92 \r
  93                 video_codec_context_ = open_stream(CODEC_TYPE_VIDEO, video_s_index_);\r
  94                 if(!video_codec_context_)\r
  95                         CASPAR_LOG(warning) << print() << " Could not open any video stream.";\r
  96                 else\r
  97                         fix_time_base(video_codec_context_.get());\r
  98                 \r
  99                 audio_codex_context_ = open_stream(CODEC_TYPE_AUDIO, audio_s_index_);\r
 100                 if(!audio_codex_context_)\r
 101                         CASPAR_LOG(warning) << print() << " Could not open any audio stream.";\r
 102                 else\r
 103                         fix_time_base(video_codec_context_.get());\r
 104 \r
 105                 if(!video_codec_context_ && !audio_codex_context_)\r
 106                         BOOST_THROW_EXCEPTION(\r
 107                                 file_read_error() << \r
 108                                 source_info(narrow(print())) << \r
 109                                 msg_info("No video or audio codec context found."));            \r
 110                         \r
 111                 executor_.start();\r
 112                 executor_.begin_invoke([this]{read_file();});\r
 113                 CASPAR_LOG(info) << print() << " Started.";\r
 114         }\r
 115 \r
 116         ~implementation()\r
 117         {\r
 118                 executor_.clear();\r
 119                 executor_.stop();\r
 120                 cond_.notify_all();\r
 121                 CASPAR_LOG(info) << print() << " Stopped.";\r
 122         }\r
 123                         \r
 124         void fix_time_base(AVCodecContext* context) // Some files give an invalid numerator, try to fix it.\r
 125         {\r
 126                 if(context && context->time_base.num == 1)\r
 127                         context->time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(context->time_base.den)))-1));\r
 128         }\r
 129 \r
 130         std::shared_ptr<AVCodecContext> open_stream(int codec_type, int& s_index)\r
 131         {               \r
 132                 AVStream** streams_end = format_context_->streams+format_context_->nb_streams;\r
 133                 AVStream** stream = std::find_if(format_context_->streams, streams_end, \r
 134                         [&](AVStream* stream) { return stream != nullptr && stream->codec->codec_type == codec_type ;});\r
 135                 \r
 136                 if(stream == streams_end) \r
 137                         return nullptr;\r
 138 \r
 139                 s_index = (*stream)->index;\r
 140                 \r
 141                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
 142                 if(codec == nullptr)\r
 143                         return nullptr;\r
 144                         \r
 145                 if((-avcodec_open((*stream)->codec, codec)) > 0)                \r
 146                         return nullptr;\r
 147 \r
 148                 return std::shared_ptr<AVCodecContext>((*stream)->codec, avcodec_close);\r
 149         }\r
 150                 \r
 151         void read_file()\r
 152         {                                       \r
 153                 AVPacket tmp_packet;\r
 154                 safe_ptr<AVPacket> read_packet(&tmp_packet, av_free_packet);    \r
 155 \r
 156                 if (av_read_frame(format_context_.get(), read_packet.get()) >= 0) // NOTE: read_packet is only valid until next call of av_read_frame or av_close_input_file\r
 157                 {\r
 158                         auto packet = std::make_shared<aligned_buffer>(read_packet->data, read_packet->data + read_packet->size);\r
 159                         if(read_packet->stream_index == video_s_index_)                 \r
 160                                 video_packet_buffer_.try_push(std::move(packet));       \r
 161                         else if(read_packet->stream_index == audio_s_index_)    \r
 162                                 audio_packet_buffer_.try_push(std::move(packet));               \r
 163                 }\r
 164                 else if(!loop_ || !seek_frame(0, AVSEEK_FLAG_BACKWARD)) // TODO: av_seek_frame does not work for all formats\r
 165                         executor_.stop();\r
 166                 else\r
 167                         graph_->add_tag("seek");                \r
 168                                         \r
 169                 graph_->update_value("input-buffer", static_cast<float>(video_packet_buffer_.size())/static_cast<float>(PACKET_BUFFER_COUNT));          \r
 170                 \r
 171                 executor_.begin_invoke([this]{read_file();});           \r
 172                 boost::unique_lock<boost::mutex> lock(mutex_);\r
 173                 while(executor_.is_running() && audio_packet_buffer_.size() > PACKET_BUFFER_COUNT && video_packet_buffer_.size() > PACKET_BUFFER_COUNT)\r
 174                         cond_.wait(lock);               \r
 175         }\r
 176         \r
 177         bool seek_frame(int64_t seek_target, int flags = 0)\r
 178         {  \r
 179                 static const AVRational TIME_BASE_Q = {1, AV_TIME_BASE};\r
 180                 \r
 181                 int stream_index = std::max(video_s_index_, audio_s_index_);\r
 182                 seek_target *= AV_TIME_BASE;\r
 183 \r
 184                 if(stream_index >= 0)     \r
 185                         seek_target = av_rescale_q(seek_target, TIME_BASE_Q, format_context_->streams[stream_index]->time_base);\r
 186           \r
 187                 bool result = av_seek_frame(format_context_.get(), stream_index, seek_target, flags) >= 0;\r
 188                 if(!result)\r
 189                         CASPAR_LOG(warning) << print() << " Failed to seek frame.";\r
 190                 return result;\r
 191         }\r
 192                 \r
 193         aligned_buffer get_video_packet()\r
 194         {\r
 195                 return get_packet(video_packet_buffer_);\r
 196         }\r
 197 \r
 198         aligned_buffer get_audio_packet()\r
 199         {\r
 200                 return get_packet(audio_packet_buffer_);\r
 201         }\r
 202         \r
 203         aligned_buffer get_packet(tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>>& buffer)\r
 204         {\r
 205                 cond_.notify_all();\r
 206                 std::shared_ptr<aligned_buffer> packet;\r
 207                 return buffer.try_pop(packet) ? std::move(*packet) : aligned_buffer();\r
 208         }\r
 209 \r
 210         bool is_eof() const\r
 211         {\r
 212                 return !executor_.is_running() && video_packet_buffer_.empty() && audio_packet_buffer_.empty();\r
 213         }\r
 214                 \r
 215         double fps() const\r
 216         {\r
 217                 return static_cast<double>(video_codec_context_->time_base.den) / static_cast<double>(video_codec_context_->time_base.num);\r
 218         }\r
 219 \r
 220         std::wstring print() const\r
 221         {\r
 222                 return (parent_printer_ ? parent_printer_() + L"/" : L"") + L"input";\r
 223         }\r
 224 };\r
 225 \r
 226 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, const printer& parent_printer) : impl_(new implementation(graph, filename, loop, parent_printer)){}\r
 227 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 228 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 229 bool input::is_eof() const{return impl_->is_eof();}\r
 230 aligned_buffer input::get_video_packet(){return impl_->get_video_packet();}\r
 231 aligned_buffer input::get_audio_packet(){return impl_->get_audio_packet();}\r
 232 double input::fps() const { return impl_->fps(); }\r
 233 }